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swscale/swscale: Use unsigned operation to avoid undefined behavior

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I have not checked that the constant is correct, this just fixes the undefined behavior

Fixes: signed integer overflow: -646656 * 3517 cannot be represented in type 'int
Fixes: 70559/clusterfuzz-testcase-minimized-ffmpeg_SWS_fuzzer-5209368631508992

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Michael Niedermayer 2024-09-12 20:08:42 +02:00 committed by Paul B Mahol
parent 334c81541d
commit e1d4f61ecc
1 changed files with 1 additions and 1 deletions
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libswscale/swscale.c
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@ -224,7 +224,7 @@ static void lumRangeFromJpeg16_c(int16_t *_dst, int width)
int i;
int32_t *dst = (int32_t *) _dst;
for (i = 0; i < width; i++)
dst[i] = (dst[i]*(14071/4) + (33561947<<4)/4)>>12;
dst[i] = ((int)(dst[i]*(14071U/4) + (33561947<<4)/4)) >> 12;
}